Inhalable Particulate (PM2.5)

Updated: Quarterly.

National Ambient Air Quality Standard: (24-hour samples; taken evey third day) A three-year average of the 98th percentile 24-hour averages equal or greater than 35 ug/m3 (micrograms per cubic meter) and/or a three-year average of annual averages equal or greater than 15.0 ug/m3 (micrograms per cubic meter).

Exceedances allowed without a violation being recorded: Two percent of daily observations.

Disclaimer: Yearly and quarterly data shown below has been subject to data review and validation procedures by the reporting agency. Monthly

The units for all averages in this chart are micrograms per cubic meter.